Burglar-alarm.



E. OGLE. BURGLAR ALARM.

APPLIOAIION FILED APE.18, 1912.

1,078,550. Patented Nov. 11, 1913.

WITNESSES: I: Y lNl/E/VTUR a 12% J EDWARD e COLUMBIA PLANOGRAPH 50.,WAsmNur0N. 1:.c.

UNITED STATES PATENT OFFICE.

BURGLAR-ALARM.

1,078,550, Specification of Letters Patent. Patented N 11, 1913, Application filed April 18, 1912. Serial No. 691,687.

To all whom it may concern: view of one of said circuit-closing devices. Be it known that I, EDWARD OGLE, citizen Fig. is a detail, sectional view of the other of the United States, residing at Dallas, in circuit -closing device, the I section being the county of Dallas and State of Texas, taken upon the line ()-C of Fig. 1. Fig. 6 5 have invented certain new and useful Imis a detail, perspective view, showing a rovements in Burglar-Alarms, of which modified form of the device illustrated in the following is a specification. Fig. 4. Fig. 7 is a duplication on a large My invention relates to new and useful scale of a portion of the structure shown improvements in burglar alarms, and relates in Fig. 1, the parts shown being a block 0 more ti l l t th t class of burglar formed on the upper portion of one of the alarms which are adapted to protect the sashes to receive one of the devices which windows of a building against intruders, the are shown in Figs. 4 and 6. alarm being automatically operated when Referring now more particularly to the the window is raised. drawing, wherein like reference characters The object of the invention is to provide designate similar parts in all the figures, the a burglar alarm of the class above-specified, numeral'l denotes a wall in which is framed that will begin to operate as soon as either a window equipped with the hereindewindow sash is slightly opened, and which scribed novel burglar alarm.- The upper and will continue to produce an alarm as long lower horizontal sill members of said win- 20 as the window remains open. dow are respectively denoted by the numer- The object, more specifically stated, is to als 2 and 3, and the side jamb (one only bemount a pair of elongated strips of metal in ing shown in the drawing), being designated one of the channels which receive the latby the numeral 4. At the top of the window eral edges of a window sash, and to mount a pair of horizontal face-boards 5 are mount- 25 upon the sash a resilient member that will ed, one within and one outside of the winbear upon said strips as soon as the sash dow, their lower edges being substantially is shifted from its closed position, thereby flush with the under surface of the upper closing an electric circuit containing an alarm sill 2. A similar pair of vertical face-boards bell in which circuit said strips are included. 6 are mounted upon the side jamb 4, one in- 35 30 Finally, the object is to provide a device side and one outside of the window, the inof the character described that will be side board being made to project into the strong, durable, simple and eflicient, and window aperture slightly beyond the side one, the various parts of which will not be jamb 4 so as to form a guide for one of the likely to get out of working order. sashes. The upper and lower sashes which 35 With these and various other objects in are respectively denoted by the numerals 7 View, my invention has relation to certain and 8, are adapted to slide vertically in novel features of the construction and operachannels separated by a parting strip 9 tion, an example of which is described in the mounted upon the side amb 4. The parting following specification, and illustrated in strip 9 in con unction with the front or in- 40 the accompanying drawing, wherein: ide face-board 6 forms a channel for the Figure 1 is a view in front elevation of the lower sash 8, and said parting strip in conlateral portion of a window, certain portions junction with a vertical strip 10 mounted of the frame and of the lower sash being upon the side jamb 4 forms a guide for the broken away to show devices mounted upon upper sash 7 45 the sashes for the purpose of closing the In the channel formed by the strips 9 and aforesaid electric circuit. Fig. 2 is a trans- 10 a pair of elongated metal strips 11 are verse, vertical, sectional view of the window, mounted upon the opposite faces of the with the sashes removed therefrom, the secstrips 9 and 10, as shown in Fig. 2 of the tion being taken upon the line A-A of Fig. drawing. At the top of that edge of the 50 1, a diagram of the electrical connections sash 7 which is adjacent to the strip 11, an being also included in this view. Fig. 3 arch-shaped member 12 is mounted stradis another transverse, vertical, sectional dling a block 18, the down-turned extremiview, the section being taken this time upon ties of said member being adapted to contact the line BB of Fig. 1, and the sashes being with the strips 11, after the sash has been 55 shown,with the circuit-closing devices which slightly lowered from its closed position. they carry. F'g. 4 is a detail, perspective The free ends of the legs of the member 12 are provided with feet 14 extending toward each other and projecting into a channel 15 formed beneath the block 13 to accommodate said feet.

In order that the device, shown in Fig. i, may be accommodated to any thickness of sash, said device may be comprised of two members adjustable to and from each other, as is shown in Fig. 6, the adjustability depending upon the provision of jaws 12 upon one of said members receiving the corresponding part of the other member.

In the channel formed between the part ing strip 9 and the interior face-board 6, a pair of elongated spaced strips 16 are vertically mounted upon the side jamb 4. In the lateral edge of the lower sash 8 is mounted a metallic member 17 slidably seated in a plate 18, which is held in place by a screw 19. Behind the plunger a recess 20 is provided in the sash in which recess is mounted a coiled spring 21 bearing upon said plunger and tending to force it into contact with the two strips 16. When the sash 8 is in its lowered position, the plunger 17 will be positioned slightly beneath the lower end of the strip 16, but as soon as the sash 8 is slightly raised, the plunger 17 will contact with both strips 16, establishing an electrical connection between the same. The two sets of strips 11 and 16 are connected in parallel with a circuit 22 which circuit also contains an electric bell 23 and a battery or other source of electromotive force 24.

t is apparent that as soon as either sash is sufliciently opened to bring the contactmaking device in a position to establish c0nnection between either pair of strips 11 and l l l l l l l 1 l l l 1 l 16, the alarm bell 23 will begin to ring and will continue to ring until the window has been again closed.

The above-described burglar alarm will preferably have its parts adjusted in such a manner that the electrical circuit will not oe closed until either sash has been opened about six inches, thus making it possible to sufiiciently ventilate a room without setting the alarm in operation. It is to be further observed that the pressure exerted by the member 12 and the plunger 17 against the sash channels will not be sufficient to offer any hindrance to the free sliding displacement of the sash.

The invention is presented as including all such changes and modifications as come within the scope of the following claim:

hat I claim is:

In a burglar alarm, the combination with a window frame, of a sash adapted to undergo vertical adjustment in said frame, channels being formed upon the sides of the frame to receive the lateral edges of the sash, a pair of vertical metallic strips mounted in one of said channels, an electrical circuit containing said strips, an alarm signal included in the electrical circuit, a source of electro-motive force included in the circuit, a block formed within one of said channels upon that extremity of the sash adapted to have contact with the sill, and an arch member straddling said block having resilient legs adapted to bear respectively upon said strips when the sash has been slightly shifted from its closed position.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EDWARD OGLE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. 0. 

